Put regex type and --grep in search::options.

src/main.cpp

@@ -83,7 +83,22 @@ int main(int argc, char *argv[])
                  vm["regexp"].as<std::vector<std::string>>())
             {
                 search::options opts;
-                // TODO: regex type.
+                if (vm.count("basic-regexp") > 0)
+                {
+                    opts.regex = search::regex_type::basic;
+                }
+                if (vm.count("extended-regexp") > 0)
+                {
+                    opts.regex = search::regex_type::extended;
+                }
+                if (vm.count("perl-regexp") > 0)
+                {
+                    opts.regex = search::regex_type::perl;
+                }
+                if (vm.count("grep") > 0)
+                {
+                    opts.grep_like = true;
+                }
                 if (vm.count("ignore-case") > 0)
                 {
                     opts.ignore_case = true;

src/search.hpp

@@ -39,9 +39,17 @@ struct match
     std::string page;      //!< The page number, if available.
 };
 
+enum class regex_type
+{
+    basic,
+    extended,
+    perl
+};
+
 struct options
 {
-    // TODO: regex type
+    regex_type regex{regex_type::basic};
+    bool grep_like{false};
     bool ignore_case{false};
     bool nostrip{false};
     std::uint64_t context{0};